O M O T O R O L A
HARDWARE PREPARATION
EXAMPLE:
To disconnect t h e VME system chassis ground from any MVME710 DB25 s e r i a l p o r t
connector, p i n 1 :
SOLDER SIDE
CUT HERE
Pin Location f o r Trace Cut
Locate j u m p e r p i n s 17 and 18 o f the jumper array associated w i t h t h e p o r t t o
be modified ( p a y a t t e n t i o n t o t h a t p o r t ' s c o n f i g u r a t i o n , i . e . , " C o n n e c t t o
Terminal" o r "Connect t o Modem"). C u t t h e t r a c e (located on t h e s o l d e r s i d e ,
not t h e component s i d e o f the board) between p i n s 1 7 a n d 1 8 w i t h a s h a r p
instrument. M a k e s u r e t h a t t h e jumper block on these pins on t h e component
side has been removed, and t e s t f o r d i s c o n t i n u i t y between these pins w i t h a n
ohmmeter. R e c o n n e c t i o n c a n be made a t any time by i n s t a l l i n g a jumper block
on t h e same p i n s .
TABLE 2 - 3 . " C o n n e c t t o Terminal" Configuration
Jumper P a i r F u n c t i o n a l Description When Connected
1 - 2
c
o
n
n
e
c
t
s
MVME332 RxD t o DB25 TxD, p i n 2
3 4
c
o
n
n
e
c
t
s
MVME332 TxD t o DB25 RxD, p i n 3
5 - 6
c
o
n
n
e
c
t
s
MVME332 CTS t o DB25 RTS, p i n 4
7 - 8
c
o
n
n
e
c
t
s
MVME332 RTS t o DB25 CTS, p i n 5
9 - 10
c
o
n
n
e
c
t
s
MVME332 DTR t o DB25 DSR, p i n 6
11 - 12
c
o
n
n
e
c
t
s
MVME332 DCD t o DB25 DCD, p i n 8
13 - 14
c
o
n
n
e
c
t
s
MVME332 DCD t o DB25 DTR, p i n 20
15 - 16
c
o
n
n
e
c
t
s
MVME332 signal GND t o DB25 signal
GND, p i n 7 (NOTE)
17 - 18
c
o
n
n
e
c
t
s
MVME710 f r o n t panel, which i s chassis
GND, t o DB25 p i n 1 (NOTE)
NOTE: T h e s e c o n n e c t i o n s a r e a c t u a l l y made by traces on t h e MVME710 c i r c u i t
board, regardless o f jumper i n s t a l l a t i o n a t t h i s l o c a t i o n . I f the user
wishes t o b r e a k e i t h e r o f these connections, t h e associated t r a c e may
be c u t between t h e header pins ( r e f e r t o preceding example f o r t r a c e
cut procedure).
8
